add data export to cli

pkg/utils/io.go

@@ -1,6 +1,43 @@
 package utils
 
-import "io"
+import (
+	"io"
+	"os"
+)
+
+// IsExists returns whether specified file or directory path exits
+func IsExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+
+	if err == nil {
+		return true, nil
+	}
+
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+
+	return false, err
+}
+
+// WriteFile would write file according to specified content
+func WriteFile(path string, data []byte) error {
+	file, err := os.Create(path)
+
+	if err != nil {
+		return err
+	}
+
+	defer file.Close()
+
+	n, err := file.Write(data)
+
+	if err == nil && n < len(data) {
+		return io.ErrShortWrite
+	}
+
+	return err
+}
 
 // IdentReader returns the original io reader
 func IdentReader(encoding string, input io.Reader) (io.Reader, error) {